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<span id="ISO_005fFORTRAN_005fENV"></span><div class="header">
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<span id="ISO_005fFORTRAN_005fENV-1"></span><h3 class="section">9.1 <code>ISO_FORTRAN_ENV</code></h3>
<dl compact="compact">
<dt><em>Standard</em>:</dt>
<dd><p>Fortran 2003 and later, except when otherwise noted
</p></dd>
</dl>

<p>The <code>ISO_FORTRAN_ENV</code> module provides the following scalar default-integer
named constants:
</p>
<dl compact="compact">
<dt><code>ATOMIC_INT_KIND</code>:</dt>
<dd><p>Default-kind integer constant to be used as kind parameter when defining
integer variables used in atomic operations. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>ATOMIC_LOGICAL_KIND</code>:</dt>
<dd><p>Default-kind integer constant to be used as kind parameter when defining
logical variables used in atomic operations. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>CHARACTER_KINDS</code>:</dt>
<dd><p>Default-kind integer constant array of rank one containing the supported kind
parameters of the <code>CHARACTER</code> type. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>CHARACTER_STORAGE_SIZE</code>:</dt>
<dd><p>Size in bits of the character storage unit.
</p>
</dd>
<dt><code>ERROR_UNIT</code>:</dt>
<dd><p>Identifies the preconnected unit used for error reporting.
</p>
</dd>
<dt><code>FILE_STORAGE_SIZE</code>:</dt>
<dd><p>Size in bits of the file-storage unit.
</p>
</dd>
<dt><code>INPUT_UNIT</code>:</dt>
<dd><p>Identifies the preconnected unit identified by the asterisk
(<code>*</code>) in <code>READ</code> statement.
</p>
</dd>
<dt><code>INT8</code>, <code>INT16</code>, <code>INT32</code>, <code>INT64</code>:</dt>
<dd><p>Kind type parameters to specify an INTEGER type with a storage
size of 16, 32, and 64 bits. It is negative if a target platform
does not support the particular kind. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>INTEGER_KINDS</code>:</dt>
<dd><p>Default-kind integer constant array of rank one containing the supported kind
parameters of the <code>INTEGER</code> type. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>IOSTAT_END</code>:</dt>
<dd><p>The value assigned to the variable passed to the <code>IOSTAT=</code> specifier of
an input/output statement if an end-of-file condition occurred.
</p>
</dd>
<dt><code>IOSTAT_EOR</code>:</dt>
<dd><p>The value assigned to the variable passed to the <code>IOSTAT=</code> specifier of
an input/output statement if an end-of-record condition occurred.
</p>
</dd>
<dt><code>IOSTAT_INQUIRE_INTERNAL_UNIT</code>:</dt>
<dd><p>Scalar default-integer constant, used by <code>INQUIRE</code> for the
<code>IOSTAT=</code> specifier to denote an that a unit number identifies an
internal unit. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>NUMERIC_STORAGE_SIZE</code>:</dt>
<dd><p>The size in bits of the numeric storage unit.
</p>
</dd>
<dt><code>LOGICAL_KINDS</code>:</dt>
<dd><p>Default-kind integer constant array of rank one containing the supported kind
parameters of the <code>LOGICAL</code> type. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>OUTPUT_UNIT</code>:</dt>
<dd><p>Identifies the preconnected unit identified by the asterisk
(<code>*</code>) in <code>WRITE</code> statement.
</p>
</dd>
<dt><code>REAL32</code>, <code>REAL64</code>, <code>REAL128</code>:</dt>
<dd><p>Kind type parameters to specify a REAL type with a storage
size of 32, 64, and 128 bits. It is negative if a target platform
does not support the particular kind. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>REAL_KINDS</code>:</dt>
<dd><p>Default-kind integer constant array of rank one containing the supported kind
parameters of the <code>REAL</code> type. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>STAT_LOCKED</code>:</dt>
<dd><p>Scalar default-integer constant used as STAT= return value by <code>LOCK</code> to
denote that the lock variable is locked by the executing image. (Fortran 2008
or later.)
</p>
</dd>
<dt><code>STAT_LOCKED_OTHER_IMAGE</code>:</dt>
<dd><p>Scalar default-integer constant used as STAT= return value by <code>UNLOCK</code> to
denote that the lock variable is locked by another image. (Fortran 2008 or
later.)
</p>
</dd>
<dt><code>STAT_STOPPED_IMAGE</code>:</dt>
<dd><p>Positive, scalar default-integer constant used as STAT= return value if the
argument in the statement requires synchronisation with an image, which has
initiated the termination of the execution. (Fortran 2008 or later.)
</p>
</dd>
<dt><code>STAT_FAILED_IMAGE</code>:</dt>
<dd><p>Positive, scalar default-integer constant used as STAT= return value if the
argument in the statement requires communication with an image, which has
is in the failed state. (TS 18508 or later.)
</p>
</dd>
<dt><code>STAT_UNLOCKED</code>:</dt>
<dd><p>Scalar default-integer constant used as STAT= return value by <code>UNLOCK</code> to
denote that the lock variable is unlocked. (Fortran 2008 or later.)
</p></dd>
</dl>

<p>The module provides the following derived type:
</p>
<dl compact="compact">
<dt><code>LOCK_TYPE</code>:</dt>
<dd><p>Derived type with private components to be use with the <code>LOCK</code> and
<code>UNLOCK</code> statement. A variable of its type has to be always declared
as coarray and may not appear in a variable-definition context.
(Fortran 2008 or later.)
</p></dd>
</dl>

<p>The module also provides the following intrinsic procedures:
<a href="COMPILER_005fOPTIONS.html">COMPILER_OPTIONS</a> and <a href="COMPILER_005fVERSION.html">COMPILER_VERSION</a>.
</p>


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